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Share Capital (Tables)

12 Months Ended

Dec. 31, 2020

Disclosure of share capital, reserves and other equity interest [Abstract]

Schedule of Common Stock Outstanding Roll Forward

			Number of Shares			Amount
Outstanding at December 31, 2018			391,250,203			$3,705.2
Shares issued through:
Share-based compensation plans			1,555,989			9.5
Shares repurchased and cancelled			(2,748,352)			(26.1)
Exercise of warrants			45			—
Flow-through share financing			1,132,169			5.9
Cancellation of unexchanged post-amalgamation shares			(119,237)			(1.2)
Outstanding at December 31, 2019			391,070,817			$3,693.3
Shares issued through:
Share-based compensation plans			1,653,361			10.3
Shares repurchased and cancelled (i)			(1,133,561)			(10.7)
Dividend reinvestment plan and share purchase plan (ii)			1,186,205			10.0
Outstanding at December 31, 2020			392,776,822			$3,702.9

Disclosure of number and weighted average exercise prices of share options

The following is a continuity of the changes in the number of stock options outstanding:

			Number			Weighted average exercise price (CAD$)
Outstanding at December 31, 2018			6,655,455			$7.38
Granted			965,876			6.59
Exercised			(1,555,989)			5.93
Expired			(1,600,080)			10.52
Outstanding at December 31, 2019			4,465,262			$6.59
Granted			876,425			7.66
Exercised			(1,653,361)			6.15
Expired			(211,747)			11.02
Outstanding at December 31, 2020			3,476,579			$6.80

Weighted average fair value assumptions used in the Black-Scholes valuation for stock options

The following table presents the weighted average fair value assumptions used in the Black-Scholes valuation:

For options granted in the year ended:			December 31, 2020			December 31, 2019
Weighted average share price at grant date (CAD$)			$7.66			$6.59
Risk-free rate			1.07% - 1.62%			1.32% - 1.68%
Expected dividend yield			1.02		%	0.84		%
Expected stock price volatility (based on historical volatility)			52		%	54		%
Expected life of option (months)			42 - 84			42 - 84
Weighted average per share fair value of stock options granted (CAD$)			$3.27			$2.95

Disclosure of number and weighted average remaining contractual life of outstanding share options

Stock options outstanding and exercisable as at December 31, 2020:

						Outstanding												Exercisable
Range of exercise prices (CAD$)						Number of options			Weighted average exercise price (CAD$)			Weighted average remaining contractual life (years)						Number of options			Weighted average exercise price (CAD$)
$3.01 - $5.00						560,000			3.75			2.05						560,000			3.75
$6.01 - $7.00						1,596,265			6.57			4.71						679,852			6.57
$7.01 - $8.00						809,184			7.62			6.02						291			7.07
$8.01 - $9.00						28,571			8.63			6.16						—			—
$9.01 - $10.00						482,559			9.62			3.18						482,559			9.62
						3,476,579			$6.80			4.39						1,722,702			$6.51

Stock options outstanding and exercisable by range of exercise prices

Stock options outstanding and exercisable as at December 31, 2020:

						Outstanding												Exercisable
Range of exercise prices (CAD$)						Number of options			Weighted average exercise price (CAD$)			Weighted average remaining contractual life (years)						Number of options			Weighted average exercise price (CAD$)
$3.01 - $5.00						560,000			3.75			2.05						560,000			3.75
$6.01 - $7.00						1,596,265			6.57			4.71						679,852			6.57
$7.01 - $8.00						809,184			7.62			6.02						291			7.07
$8.01 - $9.00						28,571			8.63			6.16						—			—
$9.01 - $10.00						482,559			9.62			3.18						482,559			9.62
						3,476,579			$6.80			4.39						1,722,702			$6.51

Continuity of the changes in the number of other long-term incentive plans (LTIP) outstanding

The following is a continuity of the changes in the number of other long-term incentive plans ("LTI") outstanding for the years ended December 31, 2020 and 2019:

			Restricted share units ("RSU")			Stock appreciation rights ("SAR")			Deferred share units ("DSU")			Performance share units ("PSU")
Outstanding units, December 31, 2018			1,567,696			509,192			645,413			983,441
Granted			832,366			—			208,882			423,628
Forfeited			(305,300)			(309,566)			—			—
Settled			(427,937)			(108,319)			(165,868)			(324,916)
Outstanding units, December 31, 2019			1,666,825			91,307			688,427			1,082,153
Granted			851,453			—			176,418			475,623
Forfeited			(201,954)			(13,195)			—			(75,892)
Settled			(347,733)			(78,112)			—			(247,866)
Outstanding units, December 31, 2020			1,968,591			—			864,845			1,234,018

Schedule of Earnings (loss) per share

						For the year ended
									December 31, 2020			December 31, 2019
Net earnings									$144.2			$96.1
Weighted average number of common shares outstanding (in thousands)									391,675			390,160
Basic earnings per share									$0.37			$0.25
Dilutive effect of potential common share equivalents (in thousands)									3,187			3,267
Diluted weighted average number of common shares outstanding (in thousands)									394,862			393,427
Diluted earnings per share									$0.37			$0.24

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The following table lists the equity securities that were excluded from the computation of diluted earnings per share as the exercise price related to these securities exceeded the average market price of the Company's common shares of CAD $10.87 and CAD $7.18 in 2019.

						For the years ended December 31,
(in thousands)									2020			2019
Stock options									—			1,420

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